This starter-kit includes everything needed to begin mining Bitcoin, including a custom ASIC controller and a USB Bitcoin ASIC Miner stick – plug it in and start mining NOW. Forget about fiddling with PCs, software updates, device drivers, Zadig this or that…

The 21 Bitcoin Computer barely fits into the category of USB Bitcoin miner. It’s more so designed to build apps, services, and devices that can be utilized via Bitcoin. Its money to harsh ratio is unimpressive, so you may not find many Bitcoin experts lining up to recommend it.